I am a student of the Westfälische Hochschule - University of Applied Sciences in Gelsenkirchen, Germany. Currently I am working on my bachelor thesis focusing on Industrie 4.0. During the past years the Institute of Internet Security developed a so-called Internet Analysis System to analyze Internet traffic and recognize specific protocols and their occurrence.

I've been instructed to determine commonly used industrial protocols and to implement a solution to detect the specific protocols within the Internet traffic.

Evaluating last years traffic data, I came across the Fieldbus protocol. But unfortunately after researching many resources, I wasn't able to find any documentation of the TCP-packet structure of the Fieldbus protocol.

I would be thankful, if someone could help me out with a documentation of the specific data fields and their lengths within the tcp header.